\begin{tabular}{l*{4}{c}}
\toprule
            &\multicolumn{1}{c}{\shortstack{Cand. runs,\\t+1}}&\multicolumn{1}{c}{\shortstack{Party runs,\\t+1}}&\multicolumn{1}{c}{\shortstack{Orient. nb. other\\cand., t+1}}&\multicolumn{1}{c}{\shortstack{Orient. nb. all\\cand., t+1}}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}\cmidrule(lr){5-5}
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
\midrule
RD\_Estimate &       0.329&       0.046&      -0.426&      -0.129\\
            &     (0.024)&     (0.021)&     (0.066)&     (0.062)\\
\midrule
Robust p-value&       0.000&       0.386&       0.000&       0.166\\
Observations&        7372&        5850&        6575&        6575\\
Polynomial order&           1&           1&           1&           1\\
Bandwidth   &       0.050&       0.050&       0.050&       0.050\\
Mean, left of threshold&       0.390&       0.796&       1.854&       2.230\\
\bottomrule
\end{tabular}
